Preliminary results

First we consider the depth of the water measured from each boat. Following the design described in Chapter 2, the depth was measured at each of 22 occasions from the two boats, one measurement from each side of each boat. In each boat there were two measurers. Each measurer had a fishing line and measured the depth of the water by slowly dropping the line until it reached the bottom. The water level was determined from a mark on the line and it was recorded in a logbook on each occasion. Thus we obtained 44 depth measurements. As described in Chapter 2, measurements were taken at the same position on several occasions according to a specified design. Depth was measured in centimeters. The determinants are boat (1 to 2), position (1 to 11), time, observer (1 to 2), latitude and longitude. These data are summarised in Figure 3.1.